Heat gun



FIG. 1 is a right side elevation view of a heat gun illustrating our new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof; and,

FIG. 7 is a top, rear and right side perspective view thereof.

The broken lines in the drawings illustrate portions of the heat gun that form no part of the claimed design. 

CLAIM The ornamental design for a heat gun, as shown and described. 